Too much zombies then zombies freezed

[madbull 0]

Date/Time: 05-20-2012

What happened: there were more than 2000 zombies on the server. Most of zombies (95%) were totally frozen and invulnerable standing straight with an invisible weapon in the hands.

Where you were: in a city

What you were doing: nothing specific, moving in the city

Current installed version: 1.5.7

Server(s) you were on: don't remember